bash: jstat: command not found

Question

I want to use the gc utility to analyse the garbage collection for my Cassandra database. But when I am running jstat command the output comes that bash:jstat: command not found. I searched and found that jstat is located in $JAVA_HOME/bin but I am not able to understand where is $JAVA_HOME/bin. I want to know how to start using jstat?

Fribourg

Answer 1

jstat is a tool which is available in jdk (development environment). If your application is using jre then only the tools under jre/bin will be available in your execution environment. Make sure to use jdk as your execution environment to use jstat tool.

Diary

Also, make sure that the same user is trying to execute it. For example if the tomcat user has ran your java, try running; sudo -H -u tomcat ./jstat -gc <pid> – Seurat

Answer 2

To see $JAVA_HOME path, you have to run the following command:

echo $JAVA_HOME

It will print java home directory path.

To run jstat, you have to go to $JAVA_HOME/bin path and run the following command:

./jstat -gc 29563

Note: gc is option (there are more options) and 29563 is java process ID. see oracle document for details.

Roughhouse